/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.druid.common.exception;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.common.collect.ImmutableList;

import java.util.List;
import java.util.Objects;
import java.util.function.Function;
import java.util.regex.Pattern;
import java.util.stream.Collectors;

public class AllowedRegexErrorResponseTransformStrategy implements ErrorResponseTransformStrategy
{
  @JsonProperty
  private final List<String> allowedRegexString;

  private final List<Pattern> allowedRegexPattern;

  @JsonCreator
  public AllowedRegexErrorResponseTransformStrategy(
      @JsonProperty("allowedRegex") List<String> allowedRegexString
  )
  {
    this.allowedRegexString = allowedRegexString;
    this.allowedRegexPattern = allowedRegexString == null
                               ? ImmutableList.of()
                               : allowedRegexString.stream().map(Pattern::compile).collect(Collectors.toList());
  }

  @Override
  public Function<String, String> getErrorMessageTransformFunction()
  {
    return (String errorMessage) -> {
      if (errorMessage == null || allowedRegexPattern.stream()
                                                     .anyMatch(pattern -> pattern.matcher(errorMessage).matches())) {
        return errorMessage;
      } else {
        return null;
      }
    };
  }

  @Override
  public boolean equals(Object o)
  {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }
    AllowedRegexErrorResponseTransformStrategy that = (AllowedRegexErrorResponseTransformStrategy) o;
    return Objects.equals(allowedRegexString, that.allowedRegexString);
  }

  @Override
  public int hashCode()
  {
    return Objects.hash(allowedRegexString);
  }
}
